It really depends... Is it only you? if so most of this is not need to such a level. You know what you want. If its more then you its always nice to keep everyone else up to day with everything.

It really matter on size. If the project is very large (couple months of development aka long enough to forget parts) then its really nice to have the extra diagrams. However personally if its smaller (couple days to a couple weeks) I just go strait in. However it does depend on some experiece here. Once you have some something enough times there is no need to plan it out. But it if it is your first time you may want to do more planning (do not over optimize...).

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